析出法分析水稻穀粒長之遺傳研究

Genetic Studies on Grain-Length by Partitioning Method in Rice

郭益全(Y. C. Kuo)

《中華農業研究》 31卷4期 (1982/12) Pp. 265-274

https://doi.org/10.29951/JARC.198212.0002

摘要

以水稻品種Mira (P1)×Norin 20(P2)之兩個親本及其Fl與F2等四個集團爲材料，探討控制水稻穀粒長之遺傳行爲。經使用遺傳分析析出法分析之結果發現：兩親本穀粒長之差異係由兩對有效因子對所支配，且穀粒短者(P2)對長者(P1)爲部份顯性，兩親本Mira (P1)及Norin 20(P2)之穀粒長基因型分別破訂爲aabb與AABB。因子交感作用之估算結果顯示對立因子對A對a有高度之部份顯性；而對立因子對B對b亦有相當程度之部份顯臣。A因子與a因子之置換，在不同之基因型遺傳背景下對穀粒長之效應並不盡相同；B因子與b因子之置換其結果亦同。因知此兩因子對非爲重覆基因。綜言之，A與a基因對及B與b基因對之顯性程寬視其所處遺傳背景之不同對稻穀粒長之支配而有若千不同程度之變異。

並列摘要

Two rice vane varieties, Mira (P1) and Norm 20 (P2) were crossed for determining the number of effective factor pairs controlling grain length. It was found by applying the partitioning method of genetic analysis that the two parents were differentiated by two effctive factor pairs. The data indicated the existence of partial phenotypic dominance for shoter length of grain (P2) over longer one (P1).
The genotypes of Mira and Norm 20 were symbolized as aabb and AABB respectively. In studing factor interactions it was found that factor A exhibited a higher degree of partial dominance over its allele a in all genotypes. However, the dominance relations between B and its allele b were not consistent for the different genotypes. In sub-stitution of a for A, the different genotypes did not have the same effect upon grain-length as did the substitution of b for B in the corresponding genotypes. It follows that these two factor pairs are not duplicates. The conclusion drawn was that the degree of dominance with regard to both A and a; and B and b was dependent upon the genetic background.